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  • wall of pleural sac


A thin layer of tissue covering the lungs and the wall of the chest cavity to protect and cushion the lungs. A small amount of fluid that acts as a lubricant allows the lungs to move smoothly in the chest cavity during breathing.

Definition from: Physician Data Query via Unified Medical Language SystemThis link leads to a site outside Genetics Home Reference. at the National Library of Medicine

See also Understanding Medical Terminology.

Published: November 23, 2015